linux-kernel - Re: [PATCH 3/3] ARM: at91/tclib: mask interruptions at shutdown and probe

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Date:	Thu, 21 Aug 2014 05:32:59 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Gaël PORTAY <gael.portay@...il.com>
Cc:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pwm@...r.kernel.org, Nicolas Ferre <nicolas.ferre@...el.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	"Jean-Christophe PLAGNIOL-VILLARD" <plagnioj@...osoft.com>
Subject: Re: [PATCH 3/3] ARM: at91/tclib: mask interruptions at shutdown and probe

On Wednesday 20 August 2014, Gaël PORTAY wrote:
> +static void tc_shutdown (struct platform_device *pdev)
> +{
> +       int i;
> +       struct atmel_tc *tc = platform_get_drvdata(pdev);
> +
> +       for (i = 0; i < 3; i++)
> +               __raw_writel(0xff, tc->regs + ATMEL_TC_REG(i, IDR));
> +}

In general, __raw_readl/__raw_writel are not meant to be called by device drivers.

Just use readl/writel by default, or readl_relaxed/writel_relaxed if the code is
performance critical and you are sure it is safe to use them.

	Arnd
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